Can you plaster over wallpaper?

Plastering over wallpaper is possible.

Although it is technically possible, specialists do not advise plastering over wallpaper. The dry surface of the wallpaper might make it challenging for the plaster to properly adhere, leading to an uneven and amateurish finish. For a smooth and durable finish, it is always better to remove the wallpaper before plastering.

However, there are certain procedures that may be taken to prepare the surface if removing the wallpaper is not an option. For example, the wallpaper can be cleaned and sanded to create a smoother surface for the plaster to adhere to. In general, it is preferable to get professional advice before attempting to plaster wallpaper over.